Variable speed belt drive



FIG. 1 is a perspective view of a variable speed belt drive, embodyingour new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is an elevational view of the side opposite the side shown inFIG. 1; and

FIG. 4 is an elevational view of the end opposite the end shown in FIG.1.

The ornamental design for a variable speed belt drive, substantially asshown.